Hello Aspirant,

Since you studied physics chemistry and biology in class 12th you cannot become a scientist in physics field because you need mathematics for that. So , you are left with Chemistry and Biology.

You can take up organic or inorganic chemistry, biology, zoology, botany etc in undergraduate course and then pursue msc and maybe phd in enter reasearch field.

You may also check this link:

https://www.careers360.com/careers/scientist

Hope this helps you!

All the best!